Since we started working with several BeagleBone Black boards we have been 
facing some weird problems. Sometimes the board got stuck when it started 
to boot.

There is no much information regarding this problem. This thread has some 
information:

https://groups.google.com/forum/#!topic/beagleboard/aXv6An1xfqI[1-25]

Finally we found some answers, and what seems to be the solution to our 
problem after some testing.

1. We avoided this problem when the serial port was connected.
2. The board runs U-Boot SPL, but it gets stuck waiting for commands, so 
the board didn't boot fully.

We connected the serial RXD pin (pin 4) to P9 VDD_3V3 pin (P9_03) to 
simulate a PULL_UP and the board didn't get stuck anymore.

Has anyone else faced the same problem ?

Best regards,

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